Help: How do you select the charater set when install oralce on NT

We have a 8i running on win2000, every
time we do exp/imp through network, we
[Quoted] got the error message

EXP-00041: Export done in server's WE8ISO8859P1, different from user's
character set US7ASCII
EXP-00000: Export terminated unsuccessfully

I do not remember when we can select
character set when install 8i on NT.
How can we choose to change the
character set on NT?

Thanks for your help.  

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